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add zones label to cache metrics (#5124)

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* add zones to cache metrics

Signed-off-by: Elijah Andrews <elijahcandrews@gmail.com>
This commit is contained in:
Elijah Andrews
2022-02-14 12:10:30 -05:00
committed by GitHub
parent d97dbbef61
commit 80195c399f
5 changed files with 35 additions and 31 deletions
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20
plugin/cache/handler.go vendored
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@@ -43,7 +43,7 @@ func (c *Cache) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
return c.doRefresh(ctx, state, crr)
}
if ttl < 0 {
servedStale.WithLabelValues(server).Inc()
servedStale.WithLabelValues(server, c.zonesMetricLabel).Inc()
// Adjust the time to get a 0 TTL in the reply built from a stale item.
now = now.Add(time.Duration(ttl) * time.Second)
cw := newPrefetchResponseWriter(server, state, c)
@@ -59,7 +59,7 @@ func (c *Cache) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
}
func (c *Cache) doPrefetch(ctx context.Context, state request.Request, cw *ResponseWriter, i *item, now time.Time) {
cachePrefetches.WithLabelValues(cw.server).Inc()
cachePrefetches.WithLabelValues(cw.server, c.zonesMetricLabel).Inc()
c.doRefresh(ctx, state, cw)
// When prefetching we loose the item i, and with it the frequency
@@ -91,41 +91,41 @@ func (c *Cache) Name() string { return "cache" }
func (c *Cache) get(now time.Time, state request.Request, server string) (*item, bool) {
k := hash(state.Name(), state.QType())
cacheRequests.WithLabelValues(server).Inc()
cacheRequests.WithLabelValues(server, c.zonesMetricLabel).Inc()
if i, ok := c.ncache.Get(k); ok && i.(*item).ttl(now) > 0 {
cacheHits.WithLabelValues(server, Denial).Inc()
cacheHits.WithLabelValues(server, Denial, c.zonesMetricLabel).Inc()
return i.(*item), true
}
if i, ok := c.pcache.Get(k); ok && i.(*item).ttl(now) > 0 {
cacheHits.WithLabelValues(server, Success).Inc()
cacheHits.WithLabelValues(server, Success, c.zonesMetricLabel).Inc()
return i.(*item), true
}
cacheMisses.WithLabelValues(server).Inc()
cacheMisses.WithLabelValues(server, c.zonesMetricLabel).Inc()
return nil, false
}
// getIgnoreTTL unconditionally returns an item if it exists in the cache.
func (c *Cache) getIgnoreTTL(now time.Time, state request.Request, server string) *item {
k := hash(state.Name(), state.QType())
cacheRequests.WithLabelValues(server).Inc()
cacheRequests.WithLabelValues(server, c.zonesMetricLabel).Inc()
if i, ok := c.ncache.Get(k); ok {
ttl := i.(*item).ttl(now)
if ttl > 0 || (c.staleUpTo > 0 && -ttl < int(c.staleUpTo.Seconds())) {
cacheHits.WithLabelValues(server, Denial).Inc()
cacheHits.WithLabelValues(server, Denial, c.zonesMetricLabel).Inc()
return i.(*item)
}
}
if i, ok := c.pcache.Get(k); ok {
ttl := i.(*item).ttl(now)
if ttl > 0 || (c.staleUpTo > 0 && -ttl < int(c.staleUpTo.Seconds())) {
cacheHits.WithLabelValues(server, Success).Inc()
cacheHits.WithLabelValues(server, Success, c.zonesMetricLabel).Inc()
return i.(*item)
}
}
cacheMisses.WithLabelValues(server).Inc()
cacheMisses.WithLabelValues(server, c.zonesMetricLabel).Inc()
return nil
}